Tree-level contributions to the rare decays , , and in the Standard Model |
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Authors: | Jernej F. Kamenik Christopher Smith |
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Affiliation: | aINFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati, Italy;bJ. Stefan Institute, Jamova 39, PO Box 3000, 1001 Ljubljana, Slovenia;cInstitut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany |
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Abstract: | The tree-level contributions to the rare decays , , and are analyzed and compared to those occurring in , , and . It is shown that these purely long-distance contributions, arising from the exchange of a charged lepton, can be significant in B+ decays for an intermediate τ, potentially blurring the distinction between the modes used to extract B+→τ+ντ and those used to probe the genuine short-distance and FCNC transitions. Numerically, the tree-level contributions are found to account for 98%, 12% and 14% of the total , , and rates, respectively. |
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Keywords: | PACS classification codes: 13.20.He 13.25.Ft 13.20.Eb |
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